GDB backtrace
(gdb) bt
#0 i_zval_ptr_dtor (zval_ptr=0x7fffffffa770) at /usr/src/debug/php-7.1.9/Zend/zend_variables.h:47
#1 _zval_ptr_dtor (zval_ptr=0x7fffffffa770) at /usr/src/debug/php-7.1.9/Zend/zend_execute_API.c:550
#2 0x00007fffed27f678 in collator_convert_object_to_string (obj=obj@entry=0x7ffff3a5d668, rv=rv@entry=0x7fffffffa770)
at /usr/src/debug/php-7.1.9/ext/intl/collator/collator_convert.c:258
#3 0x00007fffed27e367 in collator_regular_compare_function (result=0x7fffffffa810, op1=<optimized out>, op2=0x7ffff3a5d668)
at /usr/src/debug/php-7.1.9/ext/intl/collator/collator_sort.c:63
#4 0x00007fffed27e2a8 in collator_compare_func (a=a@entry=0x7ffff3a5d648, b=b@entry=0x7ffff3a5d668) at /usr/src/debug/php-7.1.9/ext/intl/collator/collator_sort.c:223
#5 0x0000555555810e95 in zend_sort_2 (swp=0x5555557fffc0 <zend_hash_bucket_renum_swap>, cmp=0x7fffed27e280 <collator_compare_func>, b=0x7ffff3a5d668, a=0x7ffff3a5d648)
at /usr/src/debug/php-7.1.9/Zend/zend_sort.c:94
#6 zend_insert_sort (base=0x7ffff3a5d648, nmemb=<optimized out>, siz=32, cmp=0x7fffed27e280 <collator_compare_func>, swp=0x5555557fffc0 <zend_hash_bucket_renum_swap>)
at /usr/src/debug/php-7.1.9/Zend/zend_sort.c:159
#7 0x0000555555808f4b in zend_hash_sort_ex (ht=ht@entry=0x7ffff3a561f8, sort=<optimized out>, compar=compar@entry=0x7fffed27e280 <collator_compare_func>,
renumber=renumber@entry=1 '\001') at /usr/src/debug/php-7.1.9/Zend/zend_hash.c:2270
#8 0x00007fffed27e89f in collator_sort_internal (renumber=1, execute_data=<optimized out>, return_value=<optimized out>)
at /usr/src/debug/php-7.1.9/ext/intl/collator/collator_sort.c:325
#9 0x00005555558972d4 in ZEND_DO_FCALL_SPEC_RETVAL_USED_HANDLER () at /usr/src/debug/php-7.1.9/Zend/zend_vm_execute.h:1097
#10 0x000055555583e0eb in execute_ex (ex=<optimized out>) at /usr/src/debug/php-7.1.9/Zend/zend_vm_execute.h:429
#11 0x0000555555899738 in zend_execute (op_array=op_array@entry=0x7ffff3a83000, return_value=return_value@entry=0x7ffff3a641c0)
at /usr/src/debug/php-7.1.9/Zend/zend_vm_execute.h:474
#12 0x00005555557f43a3 in zend_execute_scripts (type=-207540176, type@entry=8, retval=0x7ffff3a641c0, retval@entry=0x0, file_count=file_count@entry=3)
at /usr/src/debug/php-7.1.9/Zend/zend.c:1480
#13 0x0000555555790270 in php_execute_script (primary_file=primary_file@entry=0x7fffffffcf60) at /usr/src/debug/php-7.1.9/main/main.c:2552
#14 0x000055555589b99c in do_cli (argc=5, argv=0x555555c1ee10) at /usr/src/debug/php-7.1.9/sapi/cli/php_cli.c:993
#15 0x0000555555621cca in main (argc=5, argv=0x555555c1ee10) at /usr/src/debug/php-7.1.9/sapi/cli/php_cli.c:1381
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